Door closer



B A' QUINN 3,l60,910

DOOR CLOSER 2 Sheets-Sheet 2 Dec. 15, 1964 F1ed March 8 1963 

1. IN AN EXTENSIBLE AND RETRACTABLE FLUID PRESSUREOPERATED CLOSURE DEVICE OF THE TYPE ADAPTED TO BE INTERPOSED BETWEEN A DOOR FRAME AND A HINGEDLY CONNECTED DOOR, (A) AN AXIALLY ELONGATED CYLINDER HAVING CLOSURE MEANS AT ONE END, (B) PARTIAL CLOSURE MEANS AT THE OTHER END OF SAID CYLINDER AND DEFINING A RESTRICTED AXIAL OPENING, (C) A PLUNGER MEMBER, (D) SAID PLUNGER MEMBER INCLUDING A PISTON MOUNTED FOR AXIAL SLIDING MOVEMENTS WITHIN SAID CYLINDER AND HAVING ASSOCIATED THEREWITHIN AN ACTUATING ROD WHICH IS SLIDABLY RECEIVED IN SAID RESTRICTED OPENING, (E) YIELDING MEANS IN SAID CYLINDER BIASING SAID PISTON IN A DIRECTION TO RETRACT SAID ACTUATING ROD, (F) VALVE MEANS OPERATIVELY ASSOCIATED WITH SAID PISTON AND RESTRICTING THE PASSAGE THERETHROUGH OF FLUID WITHIN SAID CYLINDER DURING SAID RETRACTING MOVEMENTS, (G) MEANS SEALING ESCAPE OF FLUID FROM SAID CYLINDER BETWEEN SAID PARTIAL CLOSURE AND SAID ACTUATING ROD DURING MOVEMENTS OF SAID PLUNGER, (H) SAID MEANS INCLUDING A LONGITUDINALLY COLLAPSIBLE FLUID IMPERVIOUS TUBE CONCENTRICALLY ENCOMPASSING SAID ACTUATING ROD, ONE END OF WHICH HAS SEALING ENGAGEMENT WITH SAID PARTIAL CLOSURE MEANS AND THE OPPOSITE END OF WHICH HAS SEALING ENGAGEMENT WITH SAID PLUNGER IN AXIALLY SPACED RELATION TO SAID PARTIAL CLOSURE MEANS, (I) SAID YIELDING MEANS COMPRISING A COILED COMPRESSION SPRING INTERPOSED BETWEEN SAID CYLINDER AND SAID TUBE, AND (J) IN FURTHER COMBINATION WITH COLLAPSIBLE AND EXTENSIBLE SPACER MEANS INTERPOSED BETWEEN SAID TUBE AND SAID ACTUATING ROD AND EXTENDING FOR SUBSTANTIALLY THE FULL LENGTH OF SAID TUBE. 